Wooden stocks works as a BDSM torture device

Think of the most common BDSM torture tool that was widely used during medieval ages and I would guess that it would probably be wooden stocks. Nothing special - just a couple pieces of wood can be turned into cruel restraining device that will hold you slave motionless as long as you want. Check out this pretty nude girl is totally immobilized with these BDSM torture things and used as a sex slave.